When you ask "What number is halfway between 7 and 870?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=7 and Y=870.
To find the number halfway between 7 and 870, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 7 and 870 into our formula, we get:
(7 + 870)/2 = 438.5
Thus, the number halfway between 7 and 870 is 438.5.
To check that our answer is correct, we subtract 7 from 438.5 and subtract 438.5 from 870 and compare the two numbers:
438.5 - 7 = 431.5
870 - 438.5 = 431.5
As you can see, the halfway number is 431.5 higher than 7 and 431.5 lower than 870. Therefore, our halfway between answer of 438.5 above is correct.
Halfway Between
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Halfway Between 7 and 871
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